河流冲刷对铁路走行安全性的影响研究
发布时间：2019-01-01 08:59
【摘要】：近年来,铁路已逐渐成为我国交通运输的重要组成部分,我国铁路桥梁建设事业方兴未艾。这些桥梁中跨河跨海的不在少数,因此对铁路桥梁在河流冲刷作用下的走行安全性分析是基于我国目前工程实际的迫切需要,同时也越来越受到人们的关注。本文对群桩基础的铁路桥梁在河流冲刷作用下的动力响应进行分析,为跨河铁路桥梁的安全性研究提供参考,主要工作包括如下几个方面： 1.系统总结了车桥耦合及群桩冲刷的研究现状,对比了国内外群桩冲刷深度的计算方法。 2.分析了冲刷机理、群桩与土体相互作用机理和冲刷对群桩基础等效刚度的影响,详细介绍了用地基系数法计算冲刷前后群桩基础的等效刚度矩阵。 3.结合改长图线牡丹江特大桥的工程实际,计算了该工程在其水文地质条件下,群桩冲刷深度及冲刷前后群桩基础的等效刚度,对比分析了计算结果。 4.根据改长图线牡丹江特大桥的工程实际,建立车桥耦合有限元模型。其中车辆由50节C70货车组成,以空间梁单元模拟梁体、桥墩、承台及桩身,以刚性连接模拟各墩墩帽的连接,以弹性连接模拟承台与桩顶之间的连接。本文采用德国低干扰谱转换的时域不平顺样本,对比计算了冲刷前后桥梁和车体的动力响应,分析了计算结果。
[Abstract]:In recent years, railway has gradually become an important part of transportation in China, and railway bridge construction is in the ascendant. There are not a few bridges that cross rivers and seas, so the safety analysis of railway bridges under the action of river scour is based on the urgent need of our country's current engineering practice, and people pay more and more attention at the same time. In this paper, the dynamic response of railway bridge with pile group foundation under the action of river erosion is analyzed, which provides a reference for the safety research of railway bridge across river. The main work includes the following aspects: 1. This paper systematically summarizes the research status of vehicle-bridge coupling and pile group erosion, and compares the calculation methods of pile group erosion depth at home and abroad. 2. The scouring mechanism, interaction mechanism between pile group and soil and the effect of scouring on the equivalent stiffness of pile group foundation are analyzed. The equivalent stiffness matrix of pile group foundation before and after scouring is calculated by the method of foundation coefficient in detail. 3. Combined with the engineering practice of the Mudanjiang Bridge in the long drawing line, the erosion depth of pile group and the equivalent stiffness of pile group foundation before and after erosion are calculated under its hydrogeological conditions, and the calculation results are compared and analyzed. 4. According to the engineering practice of Mudanjiang Bridge, the coupled finite element model of vehicle-bridge is established. The vehicle is composed of 50 C70 trucks. The spatial beam element is used to simulate the connection of beam, pier, cap and pile body, the rigid connection is used to simulate the connection of pier cap, and the connection between cap and pile cap is simulated by elastic connection. In this paper, the dynamic responses of bridges and car bodies before and after scouring are compared and calculated by using the time-domain irregularity samples of low interference spectrum conversion in Germany, and the calculated results are analyzed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：U298;U447
本文编号：2397315
[Abstract]:In recent years, railway has gradually become an important part of transportation in China, and railway bridge construction is in the ascendant. There are not a few bridges that cross rivers and seas, so the safety analysis of railway bridges under the action of river scour is based on the urgent need of our country's current engineering practice, and people pay more and more attention at the same time. In this paper, the dynamic response of railway bridge with pile group foundation under the action of river erosion is analyzed, which provides a reference for the safety research of railway bridge across river. The main work includes the following aspects: 1. This paper systematically summarizes the research status of vehicle-bridge coupling and pile group erosion, and compares the calculation methods of pile group erosion depth at home and abroad. 2. The scouring mechanism, interaction mechanism between pile group and soil and the effect of scouring on the equivalent stiffness of pile group foundation are analyzed. The equivalent stiffness matrix of pile group foundation before and after scouring is calculated by the method of foundation coefficient in detail. 3. Combined with the engineering practice of the Mudanjiang Bridge in the long drawing line, the erosion depth of pile group and the equivalent stiffness of pile group foundation before and after erosion are calculated under its hydrogeological conditions, and the calculation results are compared and analyzed. 4. According to the engineering practice of Mudanjiang Bridge, the coupled finite element model of vehicle-bridge is established. The vehicle is composed of 50 C70 trucks. The spatial beam element is used to simulate the connection of beam, pier, cap and pile body, the rigid connection is used to simulate the connection of pier cap, and the connection between cap and pile cap is simulated by elastic connection. In this paper, the dynamic responses of bridges and car bodies before and after scouring are compared and calculated by using the time-domain irregularity samples of low interference spectrum conversion in Germany, and the calculated results are analyzed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：U298;U447
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